What has lots of eyes, but can’t see?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

How many times can you subtract the number 5 from 25?

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Replace the question mark with the correct number.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?